On 06/19/2019 08:24 AM, Simona Sibio via USRP-users wrote:
In attachment, there is the flowgraph on GNU radio.
In the previous email, I meat that the result is the same regarding
the amplitude accuracy, not regarding the value.
When I change the amplitude or the gain on GNU radio, also the
amplitude changes in the oscilloscope.
Thank you for your time.
Simona
What happens if, instead of using a constant, using a 10kHz tone, and
offset your Fc by 10kHz, does it look better then?
Il giorno mer 19 giu 2019 alle ore 13:00 Nick Foster
<[email protected] <mailto:[email protected]>> ha scritto:
Can you post the flowgraph you're using again? If you changed
transmit gain and amplitude, the result should have changed in
amplitude, while the image you just sent has the fame magnitude
the last one did.
On Wed, Jun 19, 2019, 5:03 AM Simona Sibio <[email protected]
<mailto:[email protected]>> wrote:
Thank you very much.
I tried to send a signal with this features, but the result is
the same (IMG_6590).
I tried with every amplitude and every gain (Screenshot from
2019).
Before, I thought that it was a problem of reference signal
and I changed it but the situation is not changed.
Thank you in advance for your help.
Best Regards,
Simona
Il giorno mar 18 giu 2019 alle ore 18:06 Nick Foster
<[email protected] <mailto:[email protected]>> ha scritto:
Turn up the transmit gain on the USRP sink. Start with
~40dB and transmit amplitude 0.3.
Nick
On Tue, Jun 18, 2019 at 9:40 AM Simona Sibio
<[email protected] <mailto:[email protected]>> wrote:
Thank you for the assistance.
I tried to change the amplitude but the amplitude and
frequency are not accurate in the oscilloscope yet.
If I lower the amplitude, the S/N is lowered then it
is worst.
Best Regards,
Simona
Il giorno mar 18 giu 2019 alle ore 18:33 Nick Foster
<[email protected] <mailto:[email protected]>>
ha scritto:
Waveform source amplitude is too high. Turn it
down to <0.4.
On Tue, Jun 18, 2019 at 9:31 AM Simona Sibio via
USRP-users <[email protected]
<mailto:[email protected]>> wrote:
Hi Michael,
thank you for your interest.
I have two N200 and each one have two
daughterboard UBX-40; the transmitters are
connected by coaxial cable to an oscilloscope
(Rhode&Schwarz RTO2064) to check the waveform.
The version of UHD is 3.13.0.
I tried to send a constant signal using the
flowgraph (Screenshot from 2019-06-18
14-56-57) in attachment on GNU radio Companion
3.7.13.4, and on the oscilloscope I saw this
"IMG_6586".
Also, I tried to generate a constant signal in
Simulink model (16-42-17 & 16-14-04) on Matlab
R2019a but, on the oscilloscope, I saw this
"IMG_6584".
I tried to send a sine signal with the
Simulink model in attachment (16-46-10) and,
on the oscilloscope, I saw this "IMG_6583".
Also I tried to generate the sine signal with
GNU radio (17-08-58) and I saw this "IMG_6588".
It is possible to see how the amplitude and
frequency change in every case, I need to
obtain an accurate signal because I have to
measure the amplitude and phase in a
particular point in the circuit.
And in the previous email, I added that the
problem increases when I lower the carrier
frequency. All these measures were taken with
a carrier frequency at 3 GHz, but if I change
the fc at 1 GHz the shape is worst, e.g. IMG_6589.
Thank you in advance.
Best Regards,
Simona
Il giorno mar 18 giu 2019 alle ore 15:34
Michael Dickens <[email protected]
<mailto:[email protected]>> ha scritto:
Hi Simona - Can you please educate us as
to a few items?
* your setup: you have an N200 + some
daughterboard (which one) + some spectrum
analyzer (which one), connected ?somehow?
-> are you doing actual wireless Tx -> Rx,
or do you have a cable hooked up between
the N200 & spectrum analyzer?
* what waveform you're trying to generate,
and what is the actual flowgraph you're
using for GNU Radio? how are you
generating the waveform in MATLAB?
* which version of GNU Radio and UHD are
you trying to use?
* which version of MATLAB and it's UHD are
you trying to use?
The above might help someone to diagnose
your issue ... without it, we can make
some guesses but not much in the way of
specifics.
Please remember to "reply all", so that
others can see your response and be able
to chime in to provide help. - MLD
On Tue, Jun 18, 2019, at 8:42 AM, Simona
Sibio via USRP-users wrote:
Dear Sir/Madam,
I am Simona Sibio, a student in Heriot
Watt University.
I am working with USRPs both on Matlab
and on Gnuradio, and with both softwares
I have the same problem: the shape
(generated by N200+daughterboard 10 MHz
to 6 GHz) is not accurate, in attacched
some photos.
At 1 GHz, the shape is worst than when
the carrier frequency is 3GHz.
It is not possible to measure the
amplitude and frequency because, also at
3 GHz, it is not stable.
Could you help me?
Thank you in advance.
Best Regards,
Simona
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